The mobile version will be warmed if you are using a "responsive theme" (same theme for desktop / mobile) where change are occurring on the client side of the session.

If you are using two separate themes, then the Cache Crawler will not crawl the mobile theme.

Why doesn't Cache Crawler work for some mobile themes?

Most stores are moving towards responsive themes. These themes do not need separate mobile crawl abilities to be cached by Cache Crawler.

Since the demand for such a feature has been low and becoming less relevant, we have not invested the development time into this topic.